Zipper tape, packaging bag with zipper tape, method for producing packaging bag with zipper tape and production device therefor

Abstract

After engagement of a male belt-like member and a female belt-like member are disengaged, a void portion is formed by punching the female belt-like member with a die. The female belt-like member having the void portion and the male belt-like member are re-engaged with each other and fed between a folded base material film that is continuously fed. A male belt-like base and a female belt-like base are heat-sealed. A seal bar heat-seals the base material film to form a bottom seal portion. A side seal bar heat-seals the base material film to form side seal portions. The cutter cuts the base material film in the middle of the side seal portions to produce the packaging bag in which three sides of the bottom seal portion and the side seal portions are heat-sealed.

1 . A zipper tape comprising:
 a male belt-like member having a male engagement portion;   a female belt-like member having a female engagement portion engageable with the male engagement portion; and   a void portion formed only on the female belt-like member at a predetermined interval in a longitudinal direction, the void portion being formed by removing the female engagement portion from the female belt-like member.   
     
     
         2 . The zipper tape according to  claim 1 , wherein
 the void portion is formed by punching.   
     
     
         3 . A packaging bag provided with a zipper tape, comprising:
 a packaging-bag film; and   the zipper tape according to  claim 1  that is attached to the packaging-bag film, wherein   the packaging-bag film is superposed on each other and is thermally welded to each other at the void portion of the zipper tape in a direction intersecting a longitudinal direction of the zipper tape.   
     
     
         4 . A method for producing a packaging bag provided with a zipper tape comprising a male belt-like member having a male engagement portion and a female belt-like member having a female engagement portion engageable with the male engagement portion, the packaging bag being provided by attaching the zipper tape on a packaging-bag film,
 the method comprising:   forming a void portion only on the female belt-like member of the zipper tape at a predetermined interval in a longitudinal direction by removing the female engagement portion from the female belt-like member;   thermally welding the zipper tape having the void portion on the packaging-bag film; and   superposing the packaging bag on each other and thermally welding the superposed packaging bag to each other at the void portion of the zipper tape in a direction intersecting a longitudinal direction of the zipper tape.   
     
     
         5 . A production device for a packaging bag provided with a zipper tape comprising a male belt-like member having a male engagement portion and a female belt-like member having a female engagement portion engageable with the male engagement portion, the packaging bag being provided by attaching the zipper tape on a packaging-bag film,
 the production device comprising:   a void-portion forming unit that is configured to form a void portion only on the female belt-like member of the zipper tape at a predetermined interval in a longitudinal direction by removing the female engagement portion from the female belt-like member;   a zipper tape attaching unit that is configured to thermally weld the zipper tape having the void portion on the packaging-bag film; and   a side-seal forming unit that is configured to superpose the packaging-bag film on each other and thermally weld the superposed packaging-bag film to each other at the void portion of the zipper tape in a direction intersecting a longitudinal direction of the zipper tape.